#include<bits/stdc++.h>
using namespace std;
int n,l,r;
int main() {
	freopen("candy.in","r",stdin);
	freopen("candy.out","w",stdout);
	scanf("%d%d%d",&n,&l,&r);
	if(r-l+1<n) {
		if(l%n<=r%n) {
			printf("%d\n",r%n);
			return 0;
		}
		printf("%d\n",n-1);
		return 0;
	}
	printf("%d\n",n-1);
	return 0;
}
